I-131: "Class of Admission"

[Waiting&Waiting]

Please help, what does "Class of Admission" really mean? I'm currently an H1B. I last entered as an F1. I currently have 130/485 pending... What should I fill in there?

Thanks very much.

 

[Triple Citizen]

I assume you are applying for an AP document? I would put "AOS applicant" in that case.